54 lines
1.5 KiB
Rust
54 lines
1.5 KiB
Rust
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#![allow(clippy::uninlined_format_args)]
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#[macro_use]
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mod macros;
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use proc_macro2::{Delimiter, Group, Literal, Punct, Spacing, TokenStream, TokenTree};
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use syn::Expr;
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#[test]
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fn test_grouping() {
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let tokens: TokenStream = TokenStream::from_iter(vec![
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TokenTree::Literal(Literal::i32_suffixed(1)),
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TokenTree::Punct(Punct::new('+', Spacing::Alone)),
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TokenTree::Group(Group::new(
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Delimiter::None,
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TokenStream::from_iter(vec![
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TokenTree::Literal(Literal::i32_suffixed(2)),
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TokenTree::Punct(Punct::new('+', Spacing::Alone)),
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TokenTree::Literal(Literal::i32_suffixed(3)),
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]),
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)),
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TokenTree::Punct(Punct::new('*', Spacing::Alone)),
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TokenTree::Literal(Literal::i32_suffixed(4)),
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]);
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assert_eq!(tokens.to_string(), "1i32 + 2i32 + 3i32 * 4i32");
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snapshot!(tokens as Expr, @r###"
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Expr::Binary {
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left: Expr::Lit {
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lit: 1i32,
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},
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op: BinOp::Add,
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right: Expr::Binary {
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left: Expr::Group {
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expr: Expr::Binary {
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left: Expr::Lit {
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lit: 2i32,
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},
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op: BinOp::Add,
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right: Expr::Lit {
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lit: 3i32,
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},
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},
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},
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op: BinOp::Mul,
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right: Expr::Lit {
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lit: 4i32,
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},
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},
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}
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"###);
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}
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